1 /* 2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * A simplified Unix domain socket which can read and write bytes at a time 26 * used for simulating external launchers which use UNIX sockets to talk 27 * the VM. 28 */ 29 30 import java.io.IOException; 31 32 public class UnixDomainSocket { 33 34 static { 35 System.loadLibrary("InheritedChannel"); 36 init(); 37 } 38 39 private final int fd; 40 private volatile String name; 41 42 public UnixDomainSocket() throws IOException { 43 this.fd = create(); 44 } 45 46 public void bind(String name) throws IOException { 47 bind0(fd, name); 48 this.name = name; 49 } 50 51 public UnixDomainSocket accept() throws IOException { 52 int newsock = accept0(fd); 53 return new UnixDomainSocket(newsock); 54 } 55 56 public UnixDomainSocket(int fd) { 57 this.fd = fd; 58 } 59 60 public void connect(String dest) throws IOException { 61 connect0(fd, dest); 62 } 63 64 public int read() throws IOException { 65 return read0(fd); 66 } 67 68 public String name() { 69 return name; 70 } 71 72 public void write(int w) throws IOException { 73 write0(fd, w); 74 } 75 76 public void close() { 77 close0(fd, name); // close0 will unlink name if non-null 78 } 79 80 public int fd() { 81 return fd; 82 } 83 84 public String toString() { 85 return "UnixDomainSocket: fd=" + Integer.toString(fd); 86 } 87 88 private static native int create() throws IOException; 89 private static native void bind0(int fd, String name) throws IOException; 90 private static native int accept0(int fd) throws IOException; 91 private static native int connect0(int fd, String name) throws IOException; 92 93 /* read and write bytes with UNIX domain sockets */ 94 95 private static native int read0(int fd) throws IOException; 96 private static native void write0(int fd, int w) throws IOException; 97 private static native void close0(int fd, String name); 98 private static native void init(); 99 public static native UnixDomainSocket[] socketpair(); 100 } 101